1 /* $OpenBSD: svc_auth_unix.c,v 1.9 2005/08/08 08:05:35 espie Exp $ */ 2 /* 3 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 4 * unrestricted use provided that this legend is included on all tape 5 * media and as a part of the software program in whole or part. Users 6 * may copy or modify Sun RPC without charge, but are not authorized 7 * to license or distribute it to anyone else except as part of a product or 8 * program developed by the user. 9 * 10 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 11 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 12 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 13 * 14 * Sun RPC is provided with no support and without any obligation on the 15 * part of Sun Microsystems, Inc. to assist in its use, correction, 16 * modification or enhancement. 17 * 18 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 19 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 20 * OR ANY PART THEREOF. 21 * 22 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 23 * or profits or other special, indirect and consequential damages, even if 24 * Sun has been advised of the possibility of such damages. 25 * 26 * Sun Microsystems, Inc. 27 * 2550 Garcia Avenue 28 * Mountain View, California 94043 29 */ 30 31 /* 32 * svc_auth_unix.c 33 * Handles UNIX flavor authentication parameters on the service side of rpc. 34 * There are two svc auth implementations here: AUTH_UNIX and AUTH_SHORT. 35 * _svcauth_unix does full blown unix style uid,gid+gids auth, 36 * _svcauth_short uses a shorthand auth to index into a cache of longhand auths. 37 * Note: the shorthand has been gutted for efficiency. 38 * 39 * Copyright (C) 1984, Sun Microsystems, Inc. 40 */ 41 42 #include <stdio.h> 43 #include <rpc/rpc.h> 44 #include <string.h> 45 46 /* 47 * Unix longhand authenticator 48 */ 49 enum auth_stat 50 _svcauth_unix(struct svc_req *rqst, struct rpc_msg *msg) 51 { 52 enum auth_stat stat; 53 XDR xdrs; 54 struct authunix_parms *aup; 55 int32_t *buf; 56 struct area { 57 struct authunix_parms area_aup; 58 char area_machname[MAX_MACHINE_NAME+1]; 59 int area_gids[NGRPS]; 60 } *area; 61 u_int auth_len; 62 u_int str_len, gid_len; 63 u_int i; 64 65 area = (struct area *) rqst->rq_clntcred; 66 aup = &area->area_aup; 67 aup->aup_machname = area->area_machname; 68 aup->aup_gids = area->area_gids; 69 auth_len = (u_int)msg->rm_call.cb_cred.oa_length; 70 xdrmem_create(&xdrs, msg->rm_call.cb_cred.oa_base, auth_len,XDR_DECODE); 71 buf = XDR_INLINE(&xdrs, auth_len); 72 if (buf != NULL) { 73 aup->aup_time = IXDR_GET_LONG(buf); 74 str_len = IXDR_GET_U_LONG(buf); 75 if (str_len > MAX_MACHINE_NAME) { 76 stat = AUTH_BADCRED; 77 goto done; 78 } 79 memcpy(aup->aup_machname, (caddr_t)buf, (u_int)str_len); 80 aup->aup_machname[str_len] = 0; 81 str_len = RNDUP(str_len); 82 buf += str_len / sizeof (int32_t); 83 aup->aup_uid = IXDR_GET_LONG(buf); 84 aup->aup_gid = IXDR_GET_LONG(buf); 85 gid_len = IXDR_GET_U_LONG(buf); 86 if (gid_len > NGRPS) { 87 stat = AUTH_BADCRED; 88 goto done; 89 } 90 aup->aup_len = gid_len; 91 for (i = 0; i < gid_len; i++) { 92 aup->aup_gids[i] = IXDR_GET_LONG(buf); 93 } 94 /* 95 * five is the smallest unix credentials structure - 96 * timestamp, hostname len (0), uid, gid, and gids len (0). 97 */ 98 if ((5 + gid_len) * BYTES_PER_XDR_UNIT + str_len > auth_len) { 99 (void) printf("bad auth_len gid %u str %u auth %u\n", 100 gid_len, str_len, auth_len); 101 stat = AUTH_BADCRED; 102 goto done; 103 } 104 } else if (! xdr_authunix_parms(&xdrs, aup)) { 105 xdrs.x_op = XDR_FREE; 106 (void)xdr_authunix_parms(&xdrs, aup); 107 stat = AUTH_BADCRED; 108 goto done; 109 } 110 rqst->rq_xprt->xp_verf.oa_flavor = AUTH_NULL; 111 rqst->rq_xprt->xp_verf.oa_length = 0; 112 stat = AUTH_OK; 113 done: 114 XDR_DESTROY(&xdrs); 115 return (stat); 116 } 117 118 119 /* 120 * Shorthand unix authenticator 121 * Looks up longhand in a cache. 122 */ 123 /*ARGSUSED*/ 124 enum auth_stat 125 _svcauth_short(struct svc_req *rqst, struct rpc_msg *msg) 126 { 127 return (AUTH_REJECTEDCRED); 128 } 129